I wanted a SA puffer a little while ago, so I'll share what I remember now.
SA Puffers are one of the most peaceful puffers you can buy, although like all puffers, they can still turn nasty, so be careful. They live in FW and do not need salt added in any case. They prefer live or frozen food, Freeze dried if the others are not available, and usually will not accept flake food.
They grow to a maximum size of 3 inchs (6 in the wild) and are also compatible with the more aggressive but smaller dwarf puffers. 1 can live in a ten gallon and 2 in a fifteen. If you had a 30 gallon a nice combination is 3-4 SA puffers and 6 dwarf puffers.
You should have lots of decorations in the tank, so that the puffer will not be as able to make eye contact with possible prey and chase them around the tank. Puffers like to have their own little den, but make sure to provide more dens than puffers, so they do not end up fighting over the "best" one.
SA puffers beaks' grow faster than any commonly sold puffer. To keep them trim, make sure to have a ready supply of snails in the tank, as the puffer will eat these, and the hard shell will wear down their teeth. Eventually though, they will need their beaks trimmed. Type in "puffer trimming" in the search box in oddballs and see if you can come up with something.
Just make sure to have a large ammount of filtration, as puffers are extremly messy, and the foods they eat pollute a lot. You should have enough filtration so that the filter/s recyle the tank volume at least 10 times per hour.
Thats all I can think of for now
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